[ADD] stock_mts_mto_rule: Add readme directory

stock_mts_mto_rule/readme/CONFIGURE.rst

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+To configure this module, you need to:
+ - You have to select 'Use MTO+MTS rules' on the company's warehouse form.

stock_mts_mto_rule/readme/CONTRIBUTORS.rst

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+* Florian da Costa <florian.dacosta@akretion.com>
+* Jared Kipe <jared@hibou.io>

stock_mts_mto_rule/readme/DESCRIPTION.rst

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+This module add a Make To Stock + Make to Order Route.
+
+If you choose the make to stock + make to order rule instead of the make to
+order route, the creation of a purchase order will depend on the virtual stock.
+There are 3 cases :
+
+1. The virtual stock of the product is 0
+    => It will act exactly like the make to order route.
+
+2. The virtual stock is equal to the quantity ordered
+    => It will act exactly like a make to stock route
+
+3. The virtual stock is more than 0 but less than ordered quantity
+    => On part of the products will be taken from stock and a purchase order
+       will be created for the rest. So it will act like both make to order and
+       make to stock rule.
+
+Example :
+We have a virtual stock of : 1 product A
+A sale Order is made for 3 products A.
+2 Procurements will be created :
+
+1. 1 with a make to stock rule and a quantity of 1
+
+2. 1 with a make to order rule and a quantity of 2.
+
+After validation, a purchase order with 2 products will be created.

stock_mts_mto_rule/readme/USAGE.rst

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+To use this module, you need to:
+ - You have to select the mts+mto route on the product form.
+ - You should not select both the mts+mto route and the mto route.